BoilerFaultCodesVokera 74 Fault Code
The Vokera 74 fault code means: your boiler is unable to move water around the system because either the main pump is stuck or the internal valves are blocked.. It appears on 3 Vokera models in our database.
Technical description: flow temperature too high /flow sensor error (2nd CH)
What causes the Vokera 74 fault?
This fault occurs when the boiler detects that water is not circulating through the heat exchanger, causing it to overheat rapidly. The most common reason is that the main pump has seized or failed, but it can also be caused by a blockage in the internal valves or a build-up of debris restricting the flow. Essentially, the boiler is generating heat but has no way to move that heat away into your radiators or hot water tank.
This issue often appears in autumn when the heating is turned back on for the first time, as the pump can seize up after sitting idle during the summer months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Vokera models that show the 74 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 74 fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026